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// Geometric Tools, LLC
// Copyright (c) 1998-2014
// Distributed under the Boost Software License, Version 1.0.
// http://www.boost.org/LICENSE_1_0.txt
// http://www.geometrictools.com/License/Boost/LICENSE_1_0.txt
//
// File Version: 5.0.0 (2010/01/01)
#include "Wm5GraphicsPCH.h"
#include "Wm5TriFan.h"
using namespace Wm5;
WM5_IMPLEMENT_RTTI(Wm5, Triangles, TriFan);
WM5_IMPLEMENT_STREAM(TriFan);
WM5_IMPLEMENT_FACTORY(TriFan);
WM5_IMPLEMENT_DEFAULT_NAMES(Triangles, TriFan);
WM5_IMPLEMENT_DEFAULT_STREAM(Triangles, TriFan);
//----------------------------------------------------------------------------
TriFan::TriFan (VertexFormat* vformat, VertexBuffer* vbuffer, int indexSize)
:
Triangles(PT_TRIFAN, vformat, vbuffer, 0)
{
assertion(indexSize == 2 || indexSize == 4, "Invalid index size.\n");
int numVertices = mVBuffer->GetNumElements();
mIBuffer = new0 IndexBuffer(numVertices, indexSize);
int i;
if (indexSize == 2)
{
short* indices = (short*)mIBuffer->GetData();
for (i = 0; i < numVertices; ++i)
{
indices[i] = (short)i;
}
}
else // indexSize == 4
{
int* indices = (int*)mIBuffer->GetData();
for (i = 0; i < numVertices; ++i)
{
indices[i] = i;
}
}
}
//----------------------------------------------------------------------------
TriFan::TriFan (VertexFormat* vformat, VertexBuffer* vbuffer,
IndexBuffer* ibuffer)
:
Triangles(PT_TRIFAN, vformat, vbuffer, ibuffer)
{
assertion(mIBuffer->GetNumElements() >= mVBuffer->GetNumElements(),
"Not enough elements for the index buffer\n");
}
//----------------------------------------------------------------------------
TriFan::~TriFan ()
{
}
//----------------------------------------------------------------------------
int TriFan::GetNumTriangles () const
{
return mIBuffer->GetNumElements() - 2;
}
//----------------------------------------------------------------------------
bool TriFan::GetTriangle (int i, int& v0, int& v1, int& v2) const
{
if (0 <= i && i < GetNumTriangles())
{
int* indices = (int*)mIBuffer->GetData();
v0 = indices[0];
v1 = indices[i + 1];
v2 = indices[i + 2];
return true;
}
return false;
}
//----------------------------------------------------------------------------
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